- Fixed a bug where evasion would be calculated slightly incorrectly on characters that have the Iron Reflexes keystone passive.

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I wonder, does anyone know what this means? Is it a recent bug? Any details?

I'm 99% positive you used to gain 3 base evasion when you took IR.
I tested it on a high level char and Ranged rushing IR during closed beta.
So it was either it added 3 base evasion, or it was some weird multiplier than gave the equivalent of 3 base evasion.